Fuel pump relay dropping out

When cold you start the car it starts up fine. it runs for about 30sec-1min then stops suddenly. it sometimes starts straight away, runs for about 30sec then stops.won't be able to restart for about 15-20min. i have changed the crankangle sensor,still the same problem.i have had the ecu chip checked,still the same problem.i have pulled the cover off the fuel pump relay and watched the contacts and noticed that as it starts to cut out the relay starts dropping out then in then out and then the car stops.

Obvious solution might be to change the relay, however here's a suggestion. When you see the relay starting to fluctuate manually hold it in the closed position to see if car still cuts out. If it does you're more that likely looking at an ignition problem as the relay needs a signal from the ignition to let it know the engine is running. If it doesn't cut out try another relay first.

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First thing to do is run a fuel pressure leakdown test. borrow or buy a fuel pressure test gage for you car and hook it to the fuel injection rail test port, then start the engine and shut it off the pressure should not drop by more than 5 PSI, if overnight it drops to near zero PSI you have a failed fuel pump pressure check valve and you need a new fuel pump. Also clean the throttle valve and the idle speed control valve with spray throttle valve cleaner.

Sounds like a fuel pressure issue. Try listening for the fuel pump to kick off while its running. If it does, its time to replace the fuel filter. You might also try swapping out the Fuel pump relay as well.

You need to have a fuel pressure gauge to check it when it wont run. Take your fuel pump relay and switch it for the horn relay. Is the ground good for the fuel pump, the wire bolts on the frame. these had problems with the connector at the fuel tank, make sure they are in good conditon and dont look like they have been hot or melted.

check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump